{notempty name="hots"}
<div>
    <h4>{$hots.name}</h4>
    <ul>
        {volist name="hots.books" id="val"}
        <li><a href="/Index/Book/info.html?book_id={$val.id}">{$val.name}</a></li>
        {/volist}
    </ul>
</div>
{/notempty}